MODELS ENGINE RATTLE

1980 Mini Other

1980 Other Mini Models 4 cyl Front Wheel Drive Manual 125000 miles

I have a 1980 mini clubman GT, 1275. I have a rattle that appears to be coming from the top of the engine. The rattle dissapears at around 2500rpm, and is not as bad when not accelerating. I have checked the timing chain for wear, this appears to be ok, any ideas what else it could be